Yield-biodiversity trade-off in patchy fields of Miscanthus × giganteus

Increasing crop productivity to meet rising demands for food and energy, but doing so in an environmentally sustainable manner, is one of the greatest challenges for agriculture to date. In Ireland, Miscanthus 9 giganteus has the potential to become a major feedstock for bioenergy production, but the economic feasibility of its cultivation depends on high yields. Miscanthus fields can have a large number of gaps in crop cover, adversely impacting yield and hence economic viability. Predominantly positive effects of Miscanthus on biodiversity reported from previous research might be attributable to high crop patchiness, particularly during the establishment phase. The aim of this research was to assess crop patchiness on a field scale and to analyse the relationship between Miscanthus yield and species richness and abundance of selected taxa of farmland wildlife. For 14 Miscanthus fields at the end of their establishment phase (4–5 years after planting), which had been planted either on improved grassland (MG) or tilled arable land (MT), we determined patchiness of the crop cover, percentage light penetration (LP) to the lower canopy, Miscanthus shoot density and height, vascular plants and epigeic arthropods. Plant species richness and noncrop vegetation cover in Miscanthus fields increased with increasing patchiness, due to higher levels of LP to the lower canopy. The species richness of ground beetles and the activity density of spiders followed the increase in vegetation cover. Plant species richness and activity density of spiders on both MT and MG fields, as well as vegetation cover and activity density of ground beetles on MG fields, were negatively associated with Miscanthus yield. In conclusion, positive effects of Miscanthus on biodiversity can diminish with increasing productivity. This matter needs to be considered when assessing the relative ecological impacts of developing biomass crops in comparison with other land use. Keywords: Araneae, Carabidae, crop cover, light penetration, Miscanthus establishment, patchiness, vascular plants, vegetation coverYield-biodiversity trade-off in patchy fields of Miscanthus × giganteuspublishedVersio

Future Generations, Discount Rates and the Optimal Harvest of Fisheries Resources

The role of discounting in determining the optimal harvest of natural resources has been extensively debated in the economic and natural resources literature. Differing approaches to discounting to address sustainability and intergenerational equity issues have the potential to significantly affect the allocation of resources between harvesting and conservation for this generation and the stock of resources available for future generations. This presents a very real problem in New Zealand where legislation requires fisheries managers to maintain the potential of the resources to meet the “reasonably foreseeable needs of future generations.” This paper investigates the appropriate use of discount rates in evaluating policy decisions that involve the intergenerational allocation of fisheries resources. Dynamic bioeconomic optimisation is used to model the effect of discount rates on the optimal harvest of a stock characterized by moderate longevity and growth. The economic and biological effects of alternative rebuilding strategies that are assumed to meet the needs of future generations are explored under alternative prices, variable costs, and rebuilding horizons. The preliminary empirical analysis revealed that higher discount rates produce lower net present values, slower rebuilding rates, and more pronounced harvest reductions as the rebuilding deadline approached. However, at discount rates that are common and justified in the literature, the effects may be insignificant. Whether these results are dependent on the assumed moderate growth characteristic of the stock, the failure to account for perceptions regarding biological and economic risk, or the use of a common discount rate are subjects of continuing research.Keywords: Discount rates, future generations, bioeconomic modelling, New Zealand Fisheries Ac

The ENCODE Project at UC Santa Cruz

The goal of the Encyclopedia Of DNA Elements (ENCODE) Project is to identify all functional elements in the human genome. The pilot phase is for comparison of existing methods and for the development of new methods to rigorously analyze a defined 1% of the human genome sequence. Experimental datasets are focused on the origin of replication, DNase I hypersensitivity, chromatin immunoprecipitation, promoter function, gene structure, pseudogenes, non-protein-coding RNAs, transcribed RNAs, multiple sequence alignment and evolutionarily constrained elements. The ENCODE project at UCSC website () is the primary portal for the sequence-based data produced as part of the ENCODE project. In the pilot phase of the project, over 30 labs provided experimental results for a total of 56 browser tracks supported by 385 database tables. The site provides researchers with a number of tools that allow them to visualize and analyze the data as well as download data for local analyses. This paper describes the portal to the data, highlights the data that has been made available, and presents the tools that have been developed within the ENCODE project. Access to the data and types of interactive analysis that are possible are illustrated through supplemental examples

Southeastern Association of Law Libraries Annual Meeting

The 2009 SEAALL Annual Meeting was held in Athens Georgia, April 16-18, 2009

Virological failure and development of new resistance mutations according to CD4 count at combination antiretroviral therapy initiation

Objectives: No randomized controlled trials have yet reported an individual patient benefit of initiating combination antiretroviral therapy (cART) at CD4 counts > 350 cells/μL. It is hypothesized that earlier initiation of cART in asymptomatic and otherwise healthy individuals may lead to poorer adherence and subsequently higher rates of resistance development. Methods: In a large cohort of HIV-positive individuals, we investigated the emergence of new resistance mutations upon virological treatment failure according to the CD4 count at the initiation of cART. Results: Of 7918 included individuals, 6514 (82.3%), 996 (12.6%) and 408 (5.2%) started cART with a CD4 count ≤ 350, 351-499 and ≥ 500 cells/μL, respectively. Virological rebound occurred while on cART in 488 (7.5%), 46 (4.6%) and 30 (7.4%) with a baseline CD4 count ≤ 350, 351-499 and ≥ 500 cells/μL, respectively. Only four (13.0%) individuals with a baseline CD4 count > 350 cells/μL in receipt of a resistance test at viral load rebound were found to have developed new resistance mutations. This compared to 107 (41.2%) of those with virological failure who had initiated cART with a CD4 count < 350 cells/μL. Conclusions: We found no evidence of increased rates of resistance development when cART was initiated at CD4 counts above 350 cells/μL. HIV Medicin

Fashion entrepreneurship education in the UK and China

Purpose – The purpose of this paper is to obtain a shared understanding of entrepreneurship education and to evaluate the effectiveness of employability and enterprise division in current fashion courses and amongst the students between a British and a Chinese university (UClan and SCAU). Design/methodology/approach – It is a three-stage action-oriented PMI2 project (Second Prime Minister's Initiative for International Education) in fashion entrepreneurship, which was funded by the British Council. This paper presents the findings of the first stage of the research project. A combination of literature reviews, participant observation, semi-structured interviews and focus groups were employed to deliver the results at this stage. Findings – The findings represent similarities and differences between UClan and SCAU related to enterprise entrepreneurship education: identify rationale of evaluating fashion entrepreneurship education; and clarify a shared understanding of entrepreneurship education and the purpose of evaluating the effectiveness. Research limitations/implications – Due to geographical restrictions and limited resources, smaller-scale samples were selected to gain a deeper insight into different approaches to fashion enterprise and entrepreneurship education between UClan and SCAU. Practical implications – This research will be valuable to academics who wish to develop or enhance fashion entrepreneurship education, in particular with regards to forging links between universities in the UK and China. Social implications – This paper will increase awareness of fashion entrepreneurship amongst students, graduates and academics. Originality/value – This research contributes to the current knowledge and best practice of fashion entrepreneurship education

Can unified theories of biodiversity explain mammalian macroecological patterns?

The idea of a unifying theory of biodiversity linking the diverse array of macroecological patterns into a common theoretical framework is very appealing. We explore this idea to examine currently proposed unified theories of biodiversity (UTBs) and their predictions. Synthesising the literature on the macroecological patterns of mammals, we critically evaluate the evidence to support these theories. We find general qualitative support for the UTBs’ predictions within mammals, but rigorous testing is hampered by the types of data typically collected in studies of mammals. In particular, abundance is rarely estimated for entire mammalian communities or of individual species in multiple locations, reflecting the logistical challenges of studying wild mammal populations. By contrast, there are numerous macroecological patterns (especially allometric scaling relationships) that are extremely well characterised for mammals, but which fall outside the scope of current UTBs. We consider how these theories might be extended to explain mammalian biodiversity patterns more generally. Specifically, we suggest that UTBs need to incorporate the dimensions of geographic space, species’ traits and time to reconcile theory with pattern